linux-kernel - Re: [PATCH v6 0/8] kdump, vmcore: support mmap() on /proc/vmcore

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Message-ID: <5195A223.2070204@zytor.com>
Date:	Thu, 16 May 2013 20:21:07 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	"Eric W. Biederman" <ebiederm@...ssion.com>
CC:	HATAYAMA Daisuke <d.hatayama@...fujitsu.com>, vgoyal@...hat.com,
	akpm@...ux-foundation.org, cpw@....com,
	kumagai-atsushi@....nes.nec.co.jp, lisa.mitchell@...com,
	kexec@...ts.infradead.org, linux-kernel@...r.kernel.org,
	zhangyanfei@...fujitsu.com, jingbai.ma@...com, linux-mm@...ck.org,
	riel@...hat.com, walken@...gle.com, hughd@...gle.com,
	kosaki.motohiro@...fujitsu.com
Subject: Re: [PATCH v6 0/8] kdump, vmcore: support mmap() on /proc/vmcore

On 05/16/2013 07:53 PM, Eric W. Biederman wrote:
> 
> That is completely and totally orthogonal to this change.
> 
> read_oldmem may have problems but in practice on a large systems those
> problems are totally dwarfed by real life performance issues that come
> from playing too much with the page tables.
> 
> I really don't find bringing up whatever foundational issues you have
> with read_oldmem() appropriate or relevant here.
> 

Well, it is in the sense that we have two pieces of code doing the same
thing, each with different bugs.

	-hpa


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